package main.java.servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


// 注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        String action = req.getParameter("action");
        if ("list".equals(action)) {
            List<User> users = userService.findAll();


            // 存储对象到作用域中
            req.setAttribute("users", users);
            // 跳转到对应的视图显示数据
            req.getRequestDispatcher("/list.jsp").forward(req, resp);
        }else if("add".equals(action)){
            req.setCharacterEncoding("UTF-8");
            // 拿到网页传递过来的用户名和密码
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");


            int result = userService.addUser(new User(name,pass));
            if (result > 0){
            // 重定向
            resp.sendRedirect("user?action=list");}
        }else if("delete".equals(action)){
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);
            //根据id查询用户信息
            int result = userService.deleteUserById(id);
            //将对象存储在作用域中

            if (result > 0){
                resp.sendRedirect("user?action=list");
            }
        }else if("toupdate".equals(action)){
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);
            //根据id查询用户信息
            User user = userService.findById(id);
            //将对象存储在作用域中
            req.setAttribute("user", user);
            // 转发到修改页面
            req.getRequestDispatcher("update.jsp").forward(req, resp);
        }else if("update".equals(action)){
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");


            int result = userService.updateUser(new User(id,name,pass));

            // 重定向
            resp.sendRedirect("user?action=list");
        }
    }
}
